Sunspot drawing of 1975-2-20

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https://doi.org/10.7891/e-manuscripta-98256



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1975-02-20
08:00
Hs 1304.5:5612
https://doi.org/10.7891/e-manuscripta-98256
Observer : Sergio Cortesi
Seeing (SIDC) : 2
No group